commit f05a2a1a4d0194e8b855a68d46925b7f4ddbbde6
Author: Louis Vallat <louis@louis-vallat.xyz>
Date:   Thu Dec 1 10:43:08 2022 +0100

    feat: day1
    
    Signed-off-by: Louis Vallat <louis@louis-vallat.xyz>

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a9d37c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+target
+Cargo.lock
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000..1a2295c
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,11 @@
+default:
+  image: rust
+
+stages:
+  - build
+
+day-1:
+  stage: build
+  script:
+    - cd day1; cargo run --release ./input
+
diff --git a/day1/Cargo.toml b/day1/Cargo.toml
new file mode 100644
index 0000000..a3c4e52
--- /dev/null
+++ b/day1/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day1"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/day1/input b/day1/input
new file mode 100644
index 0000000..24abd2e
--- /dev/null
+++ b/day1/input
@@ -0,0 +1,2237 @@
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diff --git a/day1/src/main.rs b/day1/src/main.rs
new file mode 100644
index 0000000..1953887
--- /dev/null
+++ b/day1/src/main.rs
@@ -0,0 +1,41 @@
+use std::{fs, env};
+
+fn read_input(path: &str) -> String {
+    return fs::read_to_string(path).expect("Cannot read file.");
+}
+
+fn parse_input(s: &str) -> Vec<Vec<i32>> {
+    let mut ret = vec![];
+    let mut buffer = vec![];
+    for l in s.lines() {
+        if l.is_empty() {
+            ret.push(buffer.clone());
+            buffer.clear();
+        } else {
+            buffer.push(l.parse::<i32>().unwrap())
+        }
+    }
+    return ret;
+}
+
+fn sort_and_sum(input: &Vec<Vec<i32>>) -> Vec<i32> {
+    let mut summed = input.iter()
+        .map(|i| i.iter().sum()).collect::<Vec<i32>>();
+    summed.sort();
+    return summed;
+}
+
+fn sum_of_last_n(sorted: &Vec<i32>, n: usize) -> i32 {
+    return sorted.iter().rev().take(n).sum();
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    for arg in args.iter().skip(1) {
+        println!("[{}]", &arg);
+        let vec_in = parse_input(&read_input(&arg));
+        let sorted = sort_and_sum(&vec_in);
+        println!("\t[Part 1] => Answer is '{}'.", sum_of_last_n(&sorted, 1));
+        println!("\t[Part 2] => Answer is '{}'.", sum_of_last_n(&sorted, 3));
+    }
+}